Last night, Pretty Little Liars made good on their promise and revealed Big A, but not the way we expected. Technically, we found out who A is — A is Charles — but because Charles was never unmasked during the finale, we have no idea who he is — or do we? Seconds after the finale ended, hundreds of fan theories about Charles' identity hit the interweb, some more plausible than others. And since all we can do until next season is desperately search for clues, here is an analysis of the most popular "Who Is Charles?" theories so far.

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1. Charles is Jason DiLaurentis' twin brother

As I was watching the last five minutes of the #BigAReveal last night, it all started to make sense to me: Charles is Jason DiLaurentis' twin! Marlene King has said time and time again, that Alison does not have a twin, but she never said whether or not anyone else has a twin. During the finale, Spencer came face to face with Charles in his locked lair, where an old home video was playing with Mrs. Dilaurentis and what seemed to be her three children — an infant Alison, a little Jason, and another boy we've never seen before. We know that Mrs. DiLaurentis had secrets she was willing to kill and die for — was Charles that secret?

A lot of fans have been trying to figure out exactly how Charles and Bethany are connected, and if they are even connected at all. One Seventeen reader, Reginald Lambert, presented this theory:

"Charles and Bethany are the same person. Charles was sent to Radley for wanting to be a woman. That's why Ali's mom always visited her, that's why she told Ali not to tell her dad about the second yellow dress. Bethany hated Ali because she had the life she always wanted that's why she's pissed."

Reginald, you make some really good points! We know that Bethany looked enough like Alison to have been mistaken for her when her body was found, but does that make them sisters? Maybe. But I see two problems with this theory: 1) Bethany is actually dead. OK, PLL gets crazy, but her dead body was claimed by her family, which makes it seem unlikely that she'll turn out to be Mona or Ali "dead" and turn out to be alive next season. 2) Charles basically revealed his age last night when he asked the girls to recreate Melissa Hasting's prom from seven years ago. Assuming it's a prom that he should have attended (or did attend and had a Carrie-like experience), that would make him the same age as Melissa and Jason DiLaurentis. So Charles/Bethany would have been too old to realistically be mistaken for Alison when she was a high school freshman.

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But even if Bethany and Charles are not the same person, that still doesn't answer why Charles killed Bethany. Did he mistake her for Alison? Does Alison actually have a twin? Do all the twins in the DiLaurentis family get sent away?

3. Charles is Cece Drake

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It's no secret Marlene King loves to play with words, so is it just a coincidence that Cece Drake and Charles DiLaurentis are the only people on the show with the same initials? Cece and Alison have always taken advantage of the fact that they look alike. Does anyone else remember the flashback when Mrs. DiLaurentis was called to pick up Alison from Radley, and it turned out to be Cece? Is it possible that this isn't a case of friends who look freakishly similar, but brothers and sisters with the same DNA? Cece is the same age as Charles, and we know she's sneaky (I mean, it was entirely too easy for her to escape from the Rosewood police!). Cece also has a pretty violent history, killing Detective Wildin and all — is it because he almost found out the truth about her identity? Also Charles knows some pretty deep dark secrets about all of the girls, secrets only friends know — is that why Charles/Cece befriended Alison in the first place?!

4. Lucas Gottesman is Charles

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The note found behind Mona's mirror in the second last episode this season provided fans with a huge clue, as all of the lines turned out to be an anagram for Charles DiLaurentis. Now prepare to have your minds blown (mine certainly is) because, Chandelier's rituals,Sister launched lair, A ruler's list chained are also all anagrams for "Nerd Lucas Is The Liar," as Seventeen reader Ally Lexy Vlad pointed out to us on Facebook:

"Marlene said she wanted fans to be able to piece things together. Yes, the blocks spelt out 'Charles' and Mona's anagram in her book was 'Charles Dilaurentis' but also 'Nerd Lucas is the Liar'. Lucas is Charles. Just a brother to Alison and Jason. Growing up Lucas/Charles either wanted to be like Alison or wanted to be a girl... which would explain 1. Mrs. D buying the two dresses (possibly) 2. His obsession with dolls/dollhouse 3. Why Alison hated Lucas so much, and him her. 4. Why Alison always called Lucas 'hermy' and 'Hermaphrodite' 5. Why he is making the girls act out prom, remember back at homecoming? He only went to photograph the event. Lucas is Charles, was shunned by the DiLaurentis family, and was who Mrs. D could no longer protect."

Mind Blown! But if Lucas is not Jason's twin, who were the two little boys in the home movie Charles showed Spencer? And Lucas is the same age as all of the Liars, so he would have been an infant along with Alison if he was a DiLaurentis, which means the seven year old prom the girls were forced to reenact wouldn't have meant anything to him, right?

It's nice to have a name, but without a face, what does it really mean?